Nsk Corporation

Kyodo Yushi Co., Ltd.

Takeshi Maejima

Youichi Matsumoto

Takanori Tanaka

Kinji Yukawa

Kenichi Iso

Yutaka Imai

Hironori Mizuki

Ryo Aida

Kazunori Nakagawa

A ball bearing includes an inner ring having a raceway surface, an outer ring having a raceway surface, a plurality of rolling elements rollably disposed between the raceway surface of the inner ring and the raceway surfaces of the outer ring, and a resin cage configured to retain the plurality of rolling elements between the inner ring and the outer ring. The cage is a crown type cage having an annular base portion and a plurality of pockets formed inan axial end face ofthe annular base portion, in which the pockets retain the rolling elements. An axial distance between an axial position of a center of gravity of the cage and a curvature center of a spherical or cylindrical inner surface of each of the pockets is 0.6 or more times a radius of curvature of the inner surface.A hybrid vehicle transmission has this ball bearing.

Ball bearing

A grease composition for EV/HEV driving motor bearing, containing a diurea thickener of the following formula (A): 

Grease composition for EV/HEV driving motor bearing and EV/HEV driving motor bearing

A ball bearing includes an inner ring having a raceway surface, an outer ring having a raceway surface, a plurality of rolling elements rollably disposed between the raceway surface of the inner ring and the raceway surfaces of the outer ring, and a resin cage configured to retain the plurality of rolling elements between the inner ring and the outer ring. The cage is a crown type cage having an annular base portion and a plurality of pockets formed in an axial end face of the annular base portion, in which the pockets retain the rolling elements. An axial distance between an axial position of a center of gravity of the cage and a curvature center of a spherical or cylindrical inner surface of each of the pockets is 0.6 or more times a radius of curvature of the inner surface. A hybrid vehicle transmission has this ball bearing.

Ball bearing and hybrid vehicle transmission

Growing community of inventors

Kanagawa, Japan

Takeshi Maejima